Wireless charging system having different charging modes

ABSTRACT

Provided is a wireless charging system having different wireless modes, the system comprising: a method of providing a coil having different charging modes in one set, which is performed by providing separate coils or providing a lead wire in the middle of one coil, when the coil having at least two different charging modes is provided in the one set in a receiver for the wireless charging system using non-contact magnetic induction, wherein when one charging mode is selected for one coil set, a status value of the coil for transmitting and receiving wireless power energy is detected, thereby enabling the one charging mode to be selected, and different to charging modes is mounted in one wireless charging system so that a charging mode appropriate for optimum conditions can be selected according to states and charging conditions wireless power transmitting and receiving devices.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.14/241,758, filed on Feb. 27, 2014, which is a national phase ofInternational Application No. PCT/KR2012/006849, filed Aug. 28, 2012,which claims the benefit of Korean Application No. 10-2011-0086586,filed Aug. 29, 2011, and Korean Application No. 10-2012-0083727, filedJul. 31, 2012 in the Korean Intellectual Property Office. Alldisclosures of the document(s) named above are incorporated herein byreference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates, in general, to a wireless chargingsystem, and, more particularly, to a wireless charging system havingdifferent charging modes in which one wireless charging system hasdifferent charging modes so that an optimum wireless charging mode canbe selected as needed.

2. Description of the Related Art

Technologies for realizing wireless charging by installing a wirelesstransmitter and receiver in an electrical device have been developed.That is, a non-contact magnetic induction mode, namely, a wirelesscharging mode, has been devised. The non-contact charging mode refers toa mode of providing an electric current of a charging body, namelyenergy to a storage battery of a portable electronic device usinginductive coupling by forming a first circuit operated by a highfrequency in the charging body and forming a second circuit in abattery, namely, in the portable electronic device or the storagebattery. The non-contact charging mode using the inductive coupling hasbeen already used in some application fields (for example, electrictoothbrushes, electric shavers and the like).

However, in order for the mode to be applied to portable electronicdevices, such as cellular phones, portable MP3 players, CD players, MDplayers, cassette tape players, notebook computers, PDAs and the like,the volume and a weight for a charger added to a storage battery shouldbe small, and in addition to the requirement, a deviation in chargingefficiency resulting from a position where a portable electronic deviceor a storage battery is placed should also be improved.

Furthermore, in a case where the non-contact charging mode is applied toa cellular phone or a smart phone, the improvement of a deviation isneeded, and a wireless charger based on a few modes according topredetermined modes has been only launched, and accordingly, it isproblematic in that the wireless charger may not be charged when themode is changed.

Also, in the non-contact charging mode, two or more coils are notprovided, a design standard is not determined, and an accurate structureas to if each of coils is positioned at a terminal is not described.That is, even though conventional art 1 (Korean Patent No. 10-0928439)is characterized in that a lower core is positioned between a firstupper core (coil) and a second upper core, and a controller determineswhether any core of the lower core, the first upper core and the secondupper core receives a signal transmitted from a contactless electricpower receiving device, and transmits and controls the electric powersignal through the relevant core to correspond to a result of thedetermination, the conventional art presents neither a coil (antenna)having a composite function nor an optimum design condition orstructure.

Also, even though conventional art 2 (Korean Patent No. 10-0971714) ischaracterized in that a guidance pattern core of a first core unit has alower core layer composed of a plurality of cores in an upper portion ofa PCB and an upper core layer composed of a plurality of cores in anupper portion of an interval pattern, wherein the lower core layer andthe upper core layer are positioned to cross each other and are providedin a multi-layer form, the conventional art presents neither a coil(antenna) having a composite function nor an optimum design conditionclearly.

Moreover, even though conventional art 3 (Korean Patent No. 10-1001262)provides a chargeable case for a portable cellular phone including: asupporter stably fixed and detachably attached to a portable terminal;and a charging module installed in the supporter so that a magneticfield generated from a power source supplied from the outside can betransmitted by electromagnetic induction to the portable terminal whenthe portable terminal is stably fixed to the supporter, and at the sametime, wireless charging can be carried out, the conventional art alsopresents neither a coil (antenna) having a composite function nor anoptimum design condition clearly.

Accordingly, the development of a wireless charging mode having anoptimum design condition at the same time as having different wirelessmodes has been needed.

SUMMARY OF THE INVENTION Technical Problem

Accordingly, an object of the present invention is to provide a wirelesscharging mode and design structure, which is configured such that onewireless charging system has different charging modes so that an optimumwireless charging mode can be selected according to the need of chargingconditions.

Technical Solution

In order to accomplish the above object, the present invention providesa wireless charging system having different charging modes, the systemcomprising: a method of providing a coil having different charging modesin one set, which is performed by providing separate coils or providinga lead wire in the middle of one coil, when the coil having at least twodifferent charging modes is provided in the one set in a receiver forthe wireless charging system using non-contact magnetic induction,wherein when one charging mode is selected for one coil set, a statusvalue of the coil for transmitting and receiving wireless power energyis detected, thereby enabling one charging mode to be selected.

Furthermore, when a plurality of separate other coils is provided in oneset, one of the plurality of coils may be selected, thereby enabling thewireless charging mode to be selected, and when the lead wire isprovided in the middle of the one coil, both end terminals of the onecoil may be selected or one of the both end terminals and a lead wiremay be selected, thereby enabling the wireless charging mode to beselected.

Also, when the coil set is provided in plural number, each of theplurality of coil sets may be provided with the coil having differentcharging modes.

Moreover, the coil having the different charging modes may be providedonly in a transmitter coil or only in a receiver coil.

Meanwhile, the coil having the different charging modes is provided inboth the transmitter coil and the receiver coil.

Advantageous Effects

According to the present invention, different charging modes are mountedin one wireless charging system so that a charging mode appropriate foroptimum conditions can be selected according to states and chargingconditions wireless power transmitting and receiving devices, therebyproviding a wireless charging system having different charging modes,which enables a charging mode appropriate for optimum conditionsaccording to a charging distance to be selected.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects and advantages of the invention will becomeapparent and more readily appreciated from the following description ofthe embodiments, taken in conjunction with the accompanying drawings ofwhich:

FIGS. 1 and 2 are views showing an embodiment in which a wirelesscharging coil having different charging modes is provided in one coilset;

FIGS. 3 and 4 are views showing embodiments of a wireless chargingsystem having different charging modes;

FIG. 5 is an execution flow chart of the present invention;

FIGS. 6 to 8 are views showing embodiments of a transmitter coil and areceiver coil;

FIGS. 9 to 11 are views showing embodiments of a multi-coil form;

FIGS. 12 and 13 are views of embodiments showing overlapping conditions;

FIG. 14 is a view showing another embodiment of the receiver coil andthe transmitter coil;

FIGS. 15 and 16 are views showing embodiments in which an NFC coil isprovided;

FIGS. 17 and 18 are views of embodiments showing control between a coiland an NFC coil;

FIGS. 19 and 20 are views of embodiments showing a position of the NFCcoil in a multi-coil form;

FIG. 21 is a control block diagram for a wireless charging mode in whichseparate coils each having different modes are used in one set;

FIGS. 22 to 25 are views showing embodiments in which a resonator(repeater) is provided;

FIG. 26 is a view showing embodiments in which the NFC coil is provided;

FIG. 28 is a control block diagram of a case in which the NFC coil isprovided;

FIG. 28 is a view showing another embodiment in which the NFC coil isprovided; and

FIG. 29 is a view showing another embodiment of an overlapping coilstructure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Hereinbelow, a design structure of a receiver for a wireless chargingsystem according to the present invention will be described in detail.

FIGS. 1 and 2 are views showing an example in which a wireless chargingcoil having different charging modes is provided in one coil set.

There may be several modes for charging wireless power energy, such as awireless power consortium (WPC) mode, a magnetic resonance mode, a KTPmode (mode independently developed by the present applicant), and thelike. Furthermore, when different wireless charging modes exist, thismeans that charging frequency values are changed, or impedance values ofthe coil are changed. At this time, when the impedance values of thecoil are changed, a length of the coil is also changed.

As shown in FIG. 1, both end terminals 52 a, 52 b of a reception coil 52(or a transmission coil) are provided, a lead wire 52 c is furtherprovided in the middle of the coil 52. At this time, the both endterminals and the lead wire are connected to individual switchingdevices so as to be selectively connected to a controller MCU.

That is, the both end terminals 52 a, 52 b may be connected to thecontroller, or any one of the both end terminals 52 a, 52 b may beconnected to the lead wire 52 c.

Meanwhile, as shown in FIG. 2, separate coils 52, 53 are provided. Thatis, at the inside or the outside of the coil 52 wound by a wire, theseparate coil 53 wound by another wire is further provided.

At this time, in FIG. 2, the wire of the coil is illustrated in acircular form for convenience of illustration, but it may also actuallyhave a form in which the wire is wound from the inside to the outside.

Furthermore, the coil 52 has both end terminals 52 a, 52 b, and theseparate coil 53 also has both end terminals 53 a, 53 b, 53 c, 53 d.Accordingly, only both end terminals of the coil 52 may be connected tothe controller by the switching devices, or only both end terminals ofthe separate coil 53 may be connected to the controller.

Also, FIGS. 1 and 2 show the embodiments for the reception coil as anexample, but the principle of the different charging modes may be alsoexactly applied to a transmission coil.

Moreover, as the coil of the present invention, a wireless powerconsortium (WPC) type coil 52, a KTP type coil 53, a near fieldcommunication (NFC) coil 51 used in a near field communication (NFC) maybe further provided. Furthermore, the coils 51, 52, 53 are provided inone plate (a substrate or film).

In the drawings of the present invention, the NFC coil 51 is onlyillustrated in the embodiment of FIG. 2, but it may be also provided inthe embodiment of FIG. 1. Accordingly, the NFC coil 51 may not beprovided.

A typical wireless charging system includes a transmitter fortransmitting electric power energy and a receiver for receiving electricpower energy, wherein the transmitter enables a sensor for sensing acertain signal to be driven periodically, and determines whether or nota charging request signal is sensed. When the charging request signal issensed, an electric power transmission portion of the transmitter isturned on. Furthermore, a battery voltage of the receiver is confirmedthrough a signal of the receiver, and electric power transmission isperformed when a state in which charging is possible is confirmed.

At this time, when such a state has begun in earnest, the receiverreceives the electric power energy, and the electric power is charged ina battery of the receiver.

A mode which has been typically used in wireless charging is a wirelesspower consortium (WPC) mode, and in order for wireless power energy ofthe WPC mode to be transmitted, the WPC mode should generally have thefollowing conditions.

“Voltage: 7-15V (based on the receiver), Frequency: 100-200 kHz,Current: 5V (0.7 A), Electricity: 3.5 W, Inductance value of coil: 8 to12 μH (microhenry)”

Meanwhile, the mode has a structure in which the coil and a condenserare connected in series. A medium for transmission of the wireless powerenergy is antenna loop coils 52, 53, and the antenna loop coils 52, 53are connected to the condenser in series.

Meanwhile, the KTP mode developed by the present applicant has thefollowing characteristics.

“Voltage: 7-24V (based on the receiver), Frequency: 1 to 6.78 MHz,Current: 5V (1 A), Electricity: 5 W, Inductance value of coil: 600 nH(nanohenry)-2 μH (microhenry)”

At this time, the voltage and current values may not be accuratelyconsistent with the above values, and the values may be in a range ofthe above values.

Anyway, the largest differences between the WPC mode and the KTP modeare the inductance value of the coil and the frequency value. Withregard to the difference between frequency values, the standard thereofmay be set as 1 MHz. That is, the WPC mode is 1 MHz or below (MegaHertz) which is a low frequency, and the KTP mode is 1 MHz or more (MegaHertz) which is a high frequency.

However, as a practically used frequency, the WPC mode uses a frequencyof 100 to 200 KHz, the KTP mode uses a high frequency of 6 to 8 MHz ormore.

Also, the inductance value of the coil in the WPC mode ranges from “8 to12 μH,” the inductance value of the coil in the KTP mode ranges from“600 nH to 2 μH.”

The KTP mode having these characteristics has considerable advantages.For example, since a high frequency is used in components foroscillating the frequency, miniaturization of the components (the highfrequency can typically make a size of the components small) can berealized, and due to the small inductance value of the coil, instead ofa spiral coil, the coil formed on a printed circuit board (or a resinsubstrate) by a printing method can be used as an antenna loop coil.

Since the coil is formed on the substrate, the KTP mode may beadvantageous for mass production and may have an effect of a reductionin product cost. Furthermore, the number of turns (the number of timesbeing wound) of the coil in the WPC mode should be 50 or more, and thenumber of turns of the coil in the KTP mode may be 50 or below.

Meanwhile, the number of turns is based on the number of turns appliedto a typical cellular phone, and is a number which is generallycalculated based on a case in which a maximum area of the typicalcellular phone is within 100 cm².

Also, when the inductance value in the KTP mode is 3 μH (microhenry) andthe inductance value in the WPC mode is 9 μH, the numbers of turns ofeach of the corresponding coils are different from each other.Accordingly, as shown in the drawing, the coil of the WPC mode is usedby connecting lead wires 52 a, 52 b to the front and end of the coil 52,and the coil of the KTP mode is used by connecting the lead wires 52 c,52 b to the middle of the coil 52.

Although a substrate is not illustrated in the drawings, a multi-coilform may be naturally provided on a flexible resin substrate or atypical substrate (for example, a printed circuit board (PCB), a plasticor metal substrate, or the like). Furthermore, as shown in the figure(A), the largest NFC coil 51 is provided at the most outer, and the WPCcoil 52 and the KTP coil 53 are provided in the inside thereof.

Accordingly, the substrate in the present invention may be a basesubstrate (a PCB, a metal or resin substrate, or the like) formed bycoating a loop coil, or may be a substrate just for supporting a loopcoil. At this time, the substrate for supporting the loop coil may be asimple substrate in a form in which a spiral coil is fixed to a panel (ahard or flexible panel made of metal or resin). That is, the substratemay have a form in which the spiral coil is adhered to the substrateusing a tape or an adhesive material.

At this time, the present invention uses one of the two modes, but themode of the present invention is not limited to the KTP mode or the WPCmode suggested in the embodiments of the present invention. That is,either mode of the two different modes may be selected and applied.

FIGS. 3 and 4 are views showing embodiments of a wireless chargingsystem having heterogeneous charging modes.

FIG. 3 is a view showing a receiver, and the receiver includes acontroller 10 for controlling signals and components through a fixedprogram, and a charging circuit 12 for charging voltage or electricpower in a battery of a final cellular phone 60 by adjusting the voltageor electric power according to a voltage of the battery. Furthermore, arectifier 10 a for changing an alternating current to a direct currentis also provided.

Meanwhile, the feature of the present invention is that a sensor 13 forsensing a frequency value of the coil is provided. At this time, thefunction of the sensor is not limited to sensing the frequency value.The sensor may also measure a current, impedance, capacity, voltagevalue.

Furthermore, when the MCU 10 senses the frequency value of the coilsensed by the sensor 13, a charging mode appropriate to the sensedfrequency value to may be selected.

In the present invention, a coil suitable for the charging mode isselected by a switching device SNV 14. A mode of selecting the coilappropriate to the charging mode is based on the embodiments of FIGS. 1and 2.

Moreover, the wireless charging receiver system may also include typicalother components in addition to the components illustrated in FIG. 3,but the description of the components which are not directly relevant tothe present invention is omitted.

Actually, in the charging WPC mode and the magnetic resonance mode,distances (distance between the transmitter coil and the receiver coil)for an optimum charging condition are different from each other.Accordingly, an optimum charging mode is automatically selectedaccording to a distance between the transmitter coil and the receivercoil by the present invention

At this time, the mode may be controlled by the switching device 14 orthe MCU 10 may directly perform switching control.

FIG. 4 is a view showing an embodiment of a transmitter charging system,and the system includes an MCU (controller) 60, and a power part 68 forsupplying a voltage (in generally, 5 to 9 v) which is inputted, and italso further includes an amplifier 63.

Furthermore, the sensor 13 and the switching device 14 are alsoprovided, and operation principles of the sensor 13 and the switchingdevice 14 are the same as those of FIG. 3. Accordingly, the principlefor selecting the charging mode in the transmitter charging system isthe same as that of the receiver charging system, and the effect is alsothe same as that of the receiver charging system.

At this time, the mode may be controlled by the switching device 14 orthe MCU 10 may directly perform switching control.

FIG. 5 is a view of an embodiment showing an execution flow chart of thepresent invention.

The wireless charging system includes a transmitter for transmittingelectric power energy and a receiver for receiving electric powerenergy, and when wireless power energy is transmitted or received bycharging coils 52, 53, 31, the sensor 13 is driven periodically, thussensing a situation of the charging coils 52, 53, 31 (S 100 to 102).

At this time, the charging mode may be manually selected. Even though aseparate manual switch is not illustrated in the drawings of the presentinvention, the manual selection may be performed by a typical mode. Thatis, the selection is performed using a switch, the selection by theswitch is sensed by the MCU 10, 60, and a terminal of the coil or a leadwire of the coil is selected by the MCU 10, 60 according to the sensingresult, thereby enabling the wireless charging mode to be selected (S104).

When the charging mode is not manually selected, the sensor 13 senses asituation of the charging coils 52, 53. 31. At this time, a frequency,impedance, voltage, capacity value may be analyzed (S 106-108).

Of course, the wireless charging mode may be identified by a local areato network signal even though the mode is not illustrated in the drawingof the present invention. When the mode has been identified, acorresponding coil (or a matching part) may be immediately selected.

Meanwhile, when the charging mode may not be identified by the localarea network signal, the charging mode may be identified by analyzing avoltage, frequency, impedance, inductance value because the values ofthe WPC mode, resonance mode and KTP mode are different from each other.Furthermore, the identification is performed by the controllers 10, 60according to a predetermined mode. When the identification has beencompleted, the corresponding coils 52, 53, 31 (or a terminal or leadwire) may be selected S 108 to 110.

The reason why the identification may be performed by the controllers10, 60 is because specific values for each mode are pre-stored in thecontrollers 10, 60 or a memory device (a memory device may be providedin order to perform a predetermined algorithm even though this is notseparately mentioned in the present invention), thus determining whetherthe mode is any mode based on the stored values.

Furthermore, when a frequency, voltage, impedance or capacity value ischanged according to a charging mode, the values are changed accordingto a selected charging mode. For example, as a practically usedfrequency, the WPC mode uses a frequency of 100 to 200 KHz, and the KTPmode uses a high frequency of 6 to 8 MHz or more. Therefore, the WPCmode is selected, the frequency value of a coil is changed to 100 to 200KHz, and when the KTP mode is selected, the frequency value of a coil ischanged to 6 to 8 MHz.

At this time, such a change of the frequency value is performed bygenerating a clock signal which is consistent with the frequency valuefrom the MCU 10, 60, and amplifying the frequency value through the AMP63.

Accordingly, when a coil, or a terminal or a lead wire is selectedaccording to the selected mode as described above, and a frequency valueand the like are determined, wireless power transmission and receptionoccur and a battery is charged (S 112-116).

When wireless power energy is received through the antenna coils 52, 53,the received electric power energy is controlled by the controller 10,and thus a voltage of 5 V which may be charged in the battery is finallymade, thereby enabling the battery to be charged.

That is, in the controller 10, a ratio which should be converted by therectifier according to the selected mode is determined, and thus avoltage or power appropriate for the ratio is finally outputted.

At this time, in the wireless power system of the present invention, amode of embodiments in which two modes are selected is provided. Thatis, when electric power energy is transmitted by one mode of thedetermined two modes, the receiver may receive the electric power energyin a state of a mode, which allows reception of the transmitted electricpower energy.

However, when the modes which allow transmission and reception of thetransmitted electric power energy are selected, only one of the twomodes should not be selected. That is, one of three or more modes may beselected for the transmission and reception of electric power energy ifeach of the modes may be identified and selected based on an inductance,impedance, voltage, frequency value of a coil, a local area networksignal and the like.

Accordingly, the transmitter may transmit electric power energy using adifferent mode except for the two modes. Even in this case, how a modeis appropriate for the transmitted power energy is determined based oninductance, impedance, voltage and frequency values of the coil, acommunication signal and the like, and the receiver of the presentinvention is selected according to the corresponding mode, therebyenabling the received power energy to be received.

FIGS. 6 to 8 are views showing embodiments of a transmitter and receiverof a coil.

When different charging modes are provided in the wireless chargingsystem, there is no need to provide all the modes in the transmitter andreceiver.

That is, as shown in FIG. 6, the transmitter coil 31 may be fixed by onecharging mode, and the receiver coils 52, 53 may have the differentcharging modes. Furthermore, as shown in FIG. 7, the transmitter coils31, 32 may have the different charging modes, and the receiver coil 52may be fixed by one charging mode. Also, as shown in FIG. 8, thetransmitter coils 31, 32 may have the different charging modes and thereceiver coils 52, 53 may also have the different charging modes.

When the receiver coil 31 is fixed by one mode, the receiver coils 52,53 are selected by the controller 10 of the receiver, and when thereceiver coil 52 is fixed by one mode, the transmitter coils 31, 32 areselected by the controller 60 of the transmitter.

Similarly, when the transmitter coils 31, 32 are provided by thedifferent modes, and the receiver coils 52, 53 are also provided by thedifferent modes, the transmitter coils 31, 32 are selected by thecontroller 60 of the transmitter, and the receiver coils 52, 53 areselected by the controller 10 of the receiver.

FIGS. 9 to 11 are views showing embodiments of a multi-coil form.

A separate second coil 53 in which a first coil 52 in a form of beingwounded by a wire is wound by another wire at the inside or the outsideis further provided, and the first coil and the second coil usedifferent charging modes from each other.

Furthermore, when the first coil and the second coil form one coil set,the coil set is not needed to be provided as only one coil set. That is,the coils may be provided in a multi-coil form.

That is, a first set, a second set, a third set, and an n^(th) set maybe provided.

Furthermore, as shown in FIG. 9, the two coil sets may be provided tooverlap each other, as shown in FIG. 10, the three coil sets may beprovided to overlap each other, and as shown in FIG. 11, the two coilsets may be provided not to overlap each other.

At this time, each of FIGS. 9 to 11 shows one example, and a number ofcoil sets is not limited to two or three. Also, in the present drawings,a multi-coil form may be provided and a coil having different chargingmodes may be provided.

FIGS. 12 and 13 are views of embodiments showing an overlappingcondition.

FIG. 12 is a view showing an embodiment of an overlapping area ratio.The overlapping of FIG. 12 is intended to increase uniformity of amagnetic flux rather than increasing strength of the magnetic flux.

As shown in the drawing, when an area in which a first outer coil 31 aand a second outer coil 31 b overlap is A2, a value thereof may beexpected in consideration of a purpose of the overlapping of the coils.As illustrated in the embodiment of the previous drawing, typically, thereason why the outer coil 31 and the inner coil 32 exist is intended toreduce a deviation in magnetic flux. Similarly, a design in which thecoils overlap each other is intended to reduce a deviation in magneticflux. Accordingly, in light of this matter, an overlapping area is notgood to be too big or too small. For example, when an area of the coilsis 100, it is appropriate that the overlapping area is in the range ofabout 20 to 80.

However, the overlapping area may be in the range of about 10 to 90 forthe convenience of a design.

FIG. 13 is a view of an embodiment showing a ratio of an overlappinglength. (A) shows a case in which the coils do not overlap, (B) shows acase in which the coils overlap as much as a coil length, (C) shows acase in which the coils overlap by excluding a length corresponding to acoil length. At this time, (B) shows overlapping intended to increasethe strength of a magnetic flux.

Considering each of the cases, the cases may necessarily have improveduniformity of the magnetic flux compared to a case in which only onecoil exists. This is because the number of coils is increased under thesame distance. Furthermore, it is due to a structure in which theincreased coil numbers are not consistent with each other. First, thecases of (B) and (C) show improved uniformity of the magnetic fluxcompared to the case of (A) without question. In the drawing, when “c”is an entire length of the coils, “d” is a length of only one coil, anda total number of lines of magnetic force emitted from two coils is F,by dividing the total number of lines of magnetic force by a distance, amagnetic flux density per the distance may be considered. (Practically,the magnetic flux density is indicated as an area, but in the presentembodiment, this shows one example of a method for comparing magneticfluxes to each other.

In the case of (A), the magnetic density based on the distance is M/2c,in the case of (B), the magnetic density based on the distance isM/(2c−2d), and in the case of (C), the magnetic density based on thedistance is M/(C+d). That is, in both the cases of (B) and (C), themagnetic flux density is increased compared to the case of (A).Accordingly, when an overlapping extent is represented by a distance, aminimum overlapping distance becomes “d”, and a maximum overlappingdistance becomes “c−d.” When the overlapping distance is represented asa ratio, it becomes from minimum of “d/c” to maximum of “(c−d)/c.” Whend is 0.4 cm, and c is 4 cm, the overlapping distance becomes minimum of10 to maximum of 90.

FIG. 14 is a view showing another embodiment of the receiver andtransmitter coils.

In general, a size of a transmitter device may be large, and a size of areceiver device may be small when the receiver device is mounted to asmart phone and the like. Accordingly, the transmitter coil 31 may be ina multi coil form, but the receiver coil 52 may be a single coil.

Furthermore, the transmitter coil 31 is fixed by one mode, the receivercoils 52, 52 may be provided by different charging modes. Also, thetransmitter coils 31, 32 may be provided by different charging modes,the receiver coil 52 may be fixed by one mode. Moreover, the transmittercoils 31, 32 may be provided by different charging modes, and thereceiver coils 52, 53 may be provided by different charging modes.

FIGS. 15 and 16 are views showing embodiments in which an NFC coil isprovided.

FIG. 15 is a view showing a case in which areas of the wireless powerreceiving coil 52 and the NFC coil (51) should not overlap each othereven though the coils are provided in different layers from each other.(For example, the coil 52 may be provided in a cellular terminal case61, the NFC coil 51 may be provided in a main body 70.)

That is, an area CA of the coil 52 is formed at a part in which the NFCcoil 51 is not formed in an entire area NA in which the NFC coil 51 isformed. Of course, even though the areas may partially overlap, theyshould not overlap to such a degree as to obstruct communications.

Also, the above drawing illustrates an embodiment in which the NFC coil51 is provided higher than the coil 52, but even when the NFC coil 51 isprovided lower than the coil 52, the coils should not overlap eachother.

Moreover, the above drawing is a view showing an embodiment in which thecoil 52 is provided inside the area of the NFC coil, but even when thecoil 52 is provided outside the area of the NFC coil 61, the coilsshould not overlap each other.

FIG. 16 shows a position schematic diagram of a cross section of thecoil 52 and the NFC coil 51 which are present in an integral form. (Forexample, both the coil 52 and the NFC coil 51 are provided in theportable terminal case.)

That is, in the present invention, the wireless power receiving coil 52and the NFC coil 51 may be integrally provided.

As shown in (A), the coil 52 and the NFC coil 51 may be formed on thesame substrate, and an insulating layer 55 a may be coated therebetween.Also, as shown in (B), the coil 52 and the NFC coil 51 may be formed ona separate substrate 55. Furthermore, the substrate 55 may use a typicalflexible substrate.

Meanwhile, a relative ratio of the coil 52 to the NFC coil 51 may beset, and in the present invention, the coil 52 may be provided insidethe NIFC coil 51. Accordingly, a length L1 of the NFC coil 51 may be ahorizontal thickness of the NFC coil 51 (horizontal thickness notvertical thickness). On the contrary, L2 shows a distance of an areaoccupied by the coil 52. (That is, a form of the coil 52 may have a partin which the inside of the coil is empty, but the empty part is alsoincluded in L2.)

In the present invention, a length of L2 is more than at least two timesthan a length of L1. This is intended to maximize wireless power energyreception.

Also, it is preferable that a distance (this means a right and leftdistance as viewed at the drawing) between the coil 52 and the NFC coilbe spaced to a degree. The spaced distance may be within, preferable, 1to 10 mm. Furthermore, it may be appropriate that the best spaceddistance is about 5 mm.

Meanwhile, in order to implement the present invention, the coils 51 and52 of the present invention may not be necessarily provided. The coilsmay be attached to individual components as they are. However, when thecoils 51 and 52 may be provided between coils 61-1, the coils 61-1 maybe coated with a film and the like.

FIGS. 17 and 18 are views of embodiments showing control between thecoil and the NFC coil.

In general, the NFC coil 52 is always maintained in an on state. Themeaning that the NFC coil 52 is maintained in the on state is that theNFC coil 52 and a module for controlling the NFC coil 52 are alwaysconnected to each other.

However, when the wireless charging receiving coil 51 transmits orreceives wireless power energy, the NFC coil is maintained in an offstate. At this time, that the NFC coil is maintained in the off statemeans that a connection of the NFC coil 52 and the module forcontrolling the coil 52 is blocked.

FIG. 17 is a block diagram of an embodiment showing such a principle.

A process in which the electric power energy received in the coil 52 issupplied to the portable terminal 60 is similar to that of the formerembodiment. However, data received through the NFC coil 51 istransmitted to the portable terminal 60 through a separate path.

As shown in the drawing, the receiver coil 52 and the NFC coil 51 areprovided, and the two coils are separated from each other on the basisof a circuit. Accordingly, the controller 10 for controlling a wirelesspower receiver and an NFC module 110 b for controlling the NFC coil 51are separately provided. At this time, the meaning that they areseparately provided is that functions thereof are separated, andaccordingly, the controller 10 and the NFC module 110 b may be providedas separate components or the functions thereof may be distinguished inone component.

Therefore, an accurate meaning that the coils are divided into two pathsis that a connecting line from the coil 51 to the controller 10 and aconnecting line from the NFC coil 51 to the NFC module 110 b areseparated from each other.

The NFC module 110 b refers to an NFC transmission module, and the NFCtransmission module is composed of an analogue interface, an R/F levelinterface, card mode detector, and the like and functions to transmitdata between terminals at a short distance of 10 cm.

Typically, NFC is one of electronic tags (RFID) and refers to atechnology for transmitting data between terminals at a short distanceof 10 cm with a non-contact short-range wireless communication moduleusing a frequency band of 13.56 Mz. NFC has been widely utilized inpayment devices, transmission devices of product information or travelinformation for visitors used in supermarkets or general stores, trafficdevices, access control locking devices and the like.

Furthermore, a switch 18 may be further provided, and the switch mayblock a connection of the coils by control of the controller 110 a forcontrolling the coils, and when the connection is blocked by the switch18, the function of the NFC coil 51 is stopped.

Consequently, as the controller 10 controls the wireless power receivingcoil, wireless power reception energy is received, and the controller 10blocks the switch, thereby enabling the function of the NFC to bestopped.

Meanwhile, when the wireless power reception energy is received, withregard to a mode of stopping the NFC function, different modes exceptfor the mode presented in the present invention may be also used. Themost important matter is that when the controller 10 controls thereceiver coil 51, a control command for stopping the NFC function isperformed.

FIG. 18 is a view of another embodiment, and in a main chip 110 (a chipfor controlling the portable terminal entirely) which is present in theportable terminal 60, the wireless power receiving coil 51 and the NFCcoil 52 are controlled.

That is, the main chip 110 of the portable terminal performs thefunctions of the controller 10 and the NFC module of FIG. 17. To do so,a sector which enables the functions of the controller 10 and the NFCmodule 110 b in the main chip 110 to be performed is provided.

FIGS. 19 and 20 are views of embodiments showing a position of the NFCcoil in a multi coil form.

When the receiver device has a size of a certain extent, the receivercoil may be also composed of a multi-coil form. Furthermore, when theNFC coil 51 is mounted to the receiver coils 51, there is no need tomount the NFC coil to all receiver coils. That is, the NFC coil 51 ismounted to a part of the receiver coils.

Furthermore, FIG. 19 is a view of an embodiment showing a case in whichthe NFC coil 51 is mounted to only one coil.

Meanwhile, FIG. 20 is a view showing an arrangement in which the NFCcoil 51 is mounted. In the present invention, when a coil of differentmodes is provided as a set of coils, the NFC coil is mounted to a set ofcoils positioned at the undermost portion (or a direction in which thewireless power energy is received or the NFC data energy is received).

The NFC coil 51 is mounted to a second set of coils which is a set ofcoils positioned at the undermost portion (or a direction in which thewireless power energy is received or the NFC data energy is received) asviewed in the drawing.

FIG. 21 is a control block diagram showing a wireless charging mode inwhich a coil having different charging modes is used in one coil set.

It is a view showing an embodiment in which the coil having differentcharging modes is provided as one coil set. That is, the coil 52 of theWPC mode and the coil 53 of the KTP mode are individually provided, butwhen the coils are provided as one set, the coils are separated and arethen controlled by the MCU 10. Accordingly, even though the coils areprovided as one set, they are separated, and the MCU controls the coils52, 53. A control method or configuration thereof is similar to that ofthe former embodiment.

At this time, the coils may be controlled by the switching device 14,but the MCU 10 may directly perform switching control. In the drawing,even though the receiver is illustrated, with regard to the transmitter,a coil appropriate for the selected mode may be selected according tothe same principle as that of the receiver.

A novel charging mode is a technology capable of transmitting higherpower even in a small area by raising power transmission frequency, andan embodiment thereof may be implemented under a frequency of 7.2 Mhz.In order to perform charging having compatibility between such a novelcharging mode and the WPC mode, elements which may be used in common maybe implemented by carrying out a sharing design, and elements having adifference may be individually composed.

First, the elements designed in common may be a charging circuit unit12, the MCU 10, a battery and current detector 15 (or a voltage may bealso detected) and the like. Meanwhile, data may be also used in common,and data processing may be also composed by the WPC mode.

With regard to the elements having a difference, since wireless powertransmission frequency values are different from each other, thereceiver coils may be individually formed according to the frequencyvalues, and the circuit unit for rectifying power energy signalsreceived in the second coil may be additionally formed in the firstcoil.

Regarding a technology capable of transmitting higher power even in asmall area by increasing a power transmission frequency, an embodimenthas been implemented under a frequency of 7.2 Mhz. The first coil isconfigured so that power can be transmitted under the frequency of 7.2Mhz, and in light of the fact that a high frequency is generated in amicrocomputer, and power under a frequency of a high several Mhz unit isloaded in a frequency oscillator, thereby being transmitting to thefirst coil, the technology has a difference with the conventional art.

FIGS. 22 to 25 are views showing embodiments in which a resonator (arepeater) is provided.

FIG. 22 is a view showing an embodiment in which the resonator(repeater) 52 a is provided only in a receiver 200, and FIG. 23 is aview showing an embodiment in which the resonator (repeater) 52 a isprovided only in a transmitter 300.

The wireless charger has a general structure for supplying electricpower energy, the receiver 200 has a structure in which an antenna loopcoil 52 for receiving wireless power is connected to a condenser C inseries, and the transmitter 300 has a structure in which an antenna loopcoil 31 is connected to the condenser C in parallel. At this time, theseries and parallel connections of the loop coil and the condenser maybe changed.

Furthermore, typically, the resonator 52 a may be provided in thereceiver 200 (Typically, the coil and condenser C together is called theresonator, but in the present invention, a reference numeral is onlyadded to the resonator coil for the convenience of illustration.Accordingly, the resonator in the present invention also means includingboth the coil and condenser.), and may be also provided in thetransmitter 31 a.

At this time, the antenna loop coils 31, 52 are used to transmit orreceive wireless power energy, and the resonators 31 a, 52 a function toamplify wireless power energy.

FIG. 24 is a view showing an embodiment in which the transmitter andreceiver coils are in a multi-coil form, but the resonator is providedin a single coil form, and FIG. 25 is a view showing an embodiment inwhich the transmitter and receiver coils are in a multi-coil form andthe resonator also is in a multi-coil form.

Of course, the resonator may be provided only in the transmitter, theresonator may be provided only in the receiver, or the resonator may beprovided in both the transmitter and receiver. Furthermore, when thetransmitter coil and the receiver coil are in a single coil form, theresonator becomes a single coil accordingly.

However, when the transmitter and receiver coils are in a multi-coilform, the resonator may be a single coil or a multi-coil form.

FIG. 26 is a view showing an embodiment in which the NFC coil isprovided.

When the wireless power receiving coil of the present invention isprovided in a portable terminal, the portable terminal is also providedwith the NFC antenna coil 51, but the NFC antenna coil 51 is not neededto be provided in plural number. At this time, when one NFC antenna coil51 is provided, the one NFC antenna coil 51 is positioned at the frontas shown in the drawing. Here, the front refers to a direction in whichthe transmitter of the wireless charger is positioned.

FIG. 27 is a control block diagram showing in a case which the NFC coilis provided.

In general, the NFC module is separately provided, and as shown in thedrawing, the receiver coil 52, and the NFC coil 51 are provided, and thetwo coils are separated based on a circuit. Accordingly, the controller110 a for controlling the wireless power receiver and the NFC module 110b for controlling the NFC coil 51 are individually provided. At thistime, the meaning that they are individually provided is that thefunctions thereof are separated, and accordingly, the controller 110 aand the NFC module 110 b may be provided as individual components, orthe functions thereof may be distinguished in one component.

Furthermore, because the NFC coil and the wireless charger should not besimultaneously driven, the switching device 18 is provided forperforming control so that the NFC coil and the wireless charger are notsimultaneously driven.

FIG. 28 is a view showing another embodiment in which the NFC coil isprovided.

As shown in the drawing, the NFC coil 51 may be provided in a separatearea which is not an area in which the coil of the present invention isprovided.

FIG. 29 is a view showing another embodiment of an overlapping coilstructure.

Like the embodiment of FIG. 13, the drawing shows that antennas (coil)for transmitting and receiving wireless power energy may overlap eachother, and two or more antennas may overlap.

Furthermore, the overlapping conditions (an overlapping area oroverlapping shape) presented as the embodiments of FIGS. 12 and 13 maybe completely applied even when the coil has a quadrangular shape, acircular shape, or other various shapes.

INDUSTRIAL APPLICABILITY

As described above, according to the present invention, differentcharging modes is mounted in one wireless charging system so that acharging mode appropriate for optimum conditions can be selectedaccording to states and charging conditions wireless power transmittingand receiving devices, thereby providing a wireless charging systemhaving different charging modes, which enables a charging modeappropriate for optimum conditions even according to a charging distanceto be selected.

Although a few embodiments of the present invention have been shown anddescribed, it would be appreciated by those skilled in the art thatchanges may be made in this embodiment without departing from theprinciples and spirit of the invention, the scope of which is defined inthe claims and their equivalents.

1. A wireless charging transmitter comprising: a first wireless chargingantenna set having a first base plate and a first wireless charging coilformed on the first base plate for transmitting the wireless chargingenergy, and a second wireless charging antenna set having a second baseplate and a second wireless charging coil formed on the second baseplate for transmitting the wireless charging energy, wherein the firstbase plate and the second base plate are located at different verticallevel and the first wireless charging coil and the second wirelesscharging coil are installed with an overlapping area, wherein theoverlapping area is an area occupied by both the first wireless chargingcoil and the second wireless charging coil when viewed at the top andthe overlapping area is 10% to 90% of an area occupied by the firstwireless charging coil.
 2. The wireless charging transmitter of claim 1,further comprising at least one NFC coil.
 3. The wireless chargingtransmitter of claim 2, further comprising a first NFC coil and a secondNFC coil, and wherein the first wireless charging coil and the secondwireless charging coil are provided in an inside space surrounded by thefirst NFC coil and the second NFC coil with 1 mm to 10 mm apart from thefirst NFC coil, respectively.
 4. The wireless charging transmitter ofclaim 3, wherein the distance between the wireless charging coil and thecorresponding NFC coil is 5 mm to 10 mm.
 5. The wireless chargingtransmitter of claim 3, further comprising a MCU selecting a chargingmode through data communication using one of the NFC coils; and a switchselecting the first wireless charging coil or the second wirelesscharging according to the charging mode.
 6. The wireless chargingtransmitter of claim 3, wherein the wireless charging frequencies of thefirst wireless charging coil and the second wireless charging coil aredifferent each other.
 7. The wireless charging transmitter of claim 6,wherein the first wireless charging coil transmits wireless chargingenergy at a frequency less than 1 MHz and to the second wirelesscharging coil transmits wireless charging energy at a frequency morethan 1 MHz.
 8. The wireless charging transmitter of claim 3, furthercomprising a resonator for amplifying wireless power energy.
 9. Thewireless charging transmitter of claim 5, wherein the NFC coils maintainoff state when the first wireless charging coil or the second wirelesscharging is on state.
 10. The wireless charging transmitter of claim 2,further comprising a MCU selecting a charging mode through datacommunication using the NFC coils; and a switch selecting the firstwireless charging coil or the second wireless charging according to thecharging mode.
 11. The wireless charging transmitter of claim 2, whereinthe wireless charging frequencies of the first wireless charging coiland the second wireless charging coil are different each other.
 12. Thewireless charging transmitter of claim 11, wherein the first wirelesscharging coil transmits wireless charging energy at a frequency lessthan 1 MHz and the second wireless charging coil transmits wirelesscharging energy at a frequency more than 1 MHz.
 13. The wirelesscharging transmitter of claim 2, further comprising a resonator foramplifying wireless power energy.
 14. The wireless charging transmitterof claim 2, wherein the NFC coil maintains off state when the firstwireless charging coil or the second wireless charging is on state. 15.A wireless charging system having a wireless charging transmitter and awireless charging receiver, wherein the wireless charging transmittercomprises: a first wireless charging antenna set having a first baseplate and a first wireless charging coil formed on the first base platefor transmitting the wireless charging energy, and a second wirelesscharging antenna set having a second base plate and a second wirelesscharging coil formed on the second base plate for transmitting thewireless charging energy, wherein the first base plate and the secondbase plate are located at different vertical level and the firstwireless charging coil and the second wireless charging coil areinstalled with an overlapping area, wherein the overlapping area is anarea occupied by both the first wireless charging coil and the secondwireless charging coil when viewed at the top and the overlapping areais 10% to 90% of an area occupied by the first wireless charging coil,and wherein the wireless charging receiver comprises at least onewireless charging coil for receiving the wireless charging energytransmitted from the first wireless charging coil or the second wirelesscharging coil.
 16. The wireless charging system of claim 15, wherein thewireless charging transmitter further comprises at least one NFC coil.17. The wireless charging system of claim 16, wherein the wirelesscharging receiver further comprises at least one NFC coil.
 18. Thewireless charging system of claim 16, wherein the wireless chargingtransmitter further comprises at least one resonator for amplifyingwireless power energy.
 19. The wireless charging system of claim 16,wherein the wireless charging receiver further comprises at least oneresonator for amplifying wireless power energy.
 20. The wirelesscharging transmitter of claim 17, wherein the NFC coil to maintains offstate when the first wireless charging coil or the second wirelesscharging is on state.